"I will be in MS when this movie opens," she wrote in a caption on a photo showing a scene from the film and the words "Tickets Now Available." "I think I will buy out a theatre in an underserved community there to ensure that all our brown children can see themselves as a superhero."

It's not the first such generous offer from Spencer, who made Oscar history by becoming the first African-American actress nominated multiple times after winning the award. (She won the best supporting actress Oscar for 2011's "The Help" and was nominated last month for "The Shape of Water.")

Spencer did the same for her 2016 film "Hidden Figures," for which she was also an Oscar nominee.